Description
https://pitt.zoom.us/j/91032362960
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Reza Ebadi (University of Maryland College Park)24/05/2021, 14:15Cosmology
Massive field excitations during the inflationary era, imprinted on cosmological correlation functions, have been studied as a unique opportunity to probe heavy degrees of freedom beyond the terrestrial colliders. In the simplest inflationary models, any such cosmological collider signal is exponentially suppressed for fields much heavier than the inflationary Hubble scale, limiting the...
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Jeff Kost (University of Sussex)24/05/2021, 14:30Cosmology
Current measurements of Standard-Model parameters suggest that the electroweak vacuum is metastable. This metastability has important cosmological implications because large fluctuations in the Higgs field could trigger vacuum decay in the early universe. For the false vacuum to survive, interactions which stabilize the Higgs during inflation—e.g., inflaton-Higgs interactions or non-minimal...
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Hongkai Liu (PITT)24/05/2021, 14:45Cosmology
We consider a non-Abelian dark SU(2)D model where the dark sector couples to the Standard Model (SM) through a Higgs portal. We investigate two different scenarios of the dark sector scalars with Z2 symmetry, with Higgs portal interactions that can introduce mixing between the SM Higgs boson and the SM singlet scalars in the dark sector. We utilize the existing collider results of the Higgs...
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Tomasz Krajewski (University of Warsaw)24/05/2021, 15:00Cosmology
We study the evolution of cosmological domain walls in models with asymmetric potentials. Our research goes beyond the standard case of spontaneous breaking of an approximate symmetry. The time after which the network will decay depends on the difference of values of the potential in minima, its asymmetry around the maximum separating minima and the bias of initial distribution. Using...
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Saurabh Bansal (University of Notre Dame)24/05/2021, 15:15Cosmology
Hidden naturalness offers an exciting framework for alleviating the Higgs hierarchy problem. But because the models within this framework face few constraints from collider searches, there is strong motivation to study their cosmological signatures, an area that has remained mostly unexplored. One of the simplest models that can be studied in this framework is the mirror twin Higgs (MTH)...
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Prof. Zurab Tavartkiladze (Ilia State University)24/05/2021, 15:30Cosmology
Taking the minimalistic approach, within MSSM, we propose the model of inflation in which the inflaton field is a scalar component of the MSSM state(s).
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Two cases will be discussed, which (both) turn out to be very predictive. The inflationary phase is fully governed by the MSSM Yukawa superpotential couplings. The values of the scalar spectral index and the tensor-to-scalar ratio are... -
Shinsuke Kawai (Sungkyunkwan University)24/05/2021, 15:45Cosmology
We discuss phenomenological viability of a novel inflationary model in the minimal gauge mediated supersymmetry breaking scenario.
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In this model, cosmic inflation is realized in the flat direction along the messenger supermultiplets and a natural dark matter candidate is the gravitino from the out-of-equilibrium decay of the bino-like neutralino at late times, which is called the superWIMP...